how can i set up the widget language translator on my imac since it is limited to certain languages?

as i click on f4 to use the translate widget i realized i am only able to use this translation to certain laguages , like i can not translate english to persian or arabic or other way around , i do remember i was able to use this widget , translating in many languges , but now there are only 12 languages in the list and mind(persian) is missing there. is there anyway to change or add more languages to this widget???